9m DPS?! That's INSANE! How it possible?? Priest bug?

Hello! Im from Private Cata 4.0.6 realm and i saw this: It isn't CUSTOM server, no custom items and etc. Normal item's from 4.0.6 CATA.
That is insane.. How it possible ? On recount show me at 1st place: Improved Devauring Plague and it have alooooooot of damage.
This is not mine account. This guy told me that he can do solo ALL HC raid, and kill boss in 1-2sec and this damage is just a bug that only works on 4.0.6 priest. How it possible ??

Too often, we are mistaken for druidic types. perhaps that's true for some shaman, but do not let yourself be plagued by the ignorant belief that we are always peaceful.
Nothing about what I do is harmonious. I command the elements to my will. There is nothing offered in return. I would have it no other way.

But really? Can you get 9m dps ? And it isn't custom server with custom stats -.-

Then how do you play a patch from 2 years ago? It must be a non live server ie a private server, and you're going to take someones word for it that it's not tampered with? Also, private servers are against the TOS as you know so coming on here and parading that is really smart if getting your mmoc account banned is what makes you happy.